added installation instructions for Mac and Linux

README.md

@@ -17,8 +17,48 @@ Anyways my account will probs be hidden for the next week or so idk how long thi
 - fly, noclip, wireframe, fast mode (https://github.com/MinetestClients/OpenClient/commit/fb1651b55ce379e0da37b33da91f9d9d3288e73b)
 
 # installation:
-Apple & Linux:
-look at github.com/minetest/minetest
+Mac OS:      
+There are 2 easy ways you can install the latest version of OpenClient. The first is through brew install: https://github.com/MinetestClients/brewinstall (look in your /usr/local/Cellar folder to find minetest after you install it)      
+The second method is through OpenClient's releases: https://github.com/MinetestClients/OpenClient/releases/download/v1.1/OpenClient.dmg    
+
+Linux:      
+1) Install dependencies:   
+       
+For Debian/Ubuntu users:
+
+    sudo apt install g++ make libc6-dev libirrlicht-dev cmake libbz2-dev libpng-dev libjpeg-dev libxxf86vm-dev libgl1-mesa-dev libsqlite3-dev libogg-dev libvorbis-dev libopenal-dev libcurl4-gnutls-dev libfreetype6-dev zlib1g-dev libgmp-dev libjsoncpp-dev
+
+For Fedora users:
+
+    sudo dnf install make automake gcc gcc-c++ kernel-devel cmake libcurl-devel openal-soft-devel libvorbis-devel libXxf86vm-devel libogg-devel freetype-devel mesa-libGL-devel zlib-devel jsoncpp-devel irrlicht-devel bzip2-libs gmp-devel sqlite-devel luajit-devel leveldb-devel ncurses-devel doxygen spatialindex-devel bzip2-devel
+    
+For Arch users:
+
+    sudo pacman -S base-devel libcurl-gnutls cmake libxxf86vm irrlicht libpng sqlite libogg libvorbis openal freetype2 jsoncpp gmp luajit leveldb ncurses
+
+For Alpine users:
+
+    sudo apk add build-base irrlicht-dev cmake bzip2-dev libpng-dev jpeg-dev libxxf86vm-dev mesa-dev sqlite-dev libogg-dev libvorbis-dev openal-soft-dev curl-dev freetype-dev zlib-dev gmp-dev jsoncpp-dev luajit-dev
+
+2) Download code (OpenClient & minetest_game)
+`
+    wget https://github.com/MinetestClients/OpenClient/archive/v1.1.tar.gz
+    tar xf OpenClient-1.1.tar.gz
+    cd OpenClient-1.1
+    cd games/
+    wget https://github.com/minetest/minetest_game/archive/5.0.1.tar.gz
+    tar xf minetest_game-5.0.1.tar.gz
+    cd ..
+`
+
+3) Build:
+`
+    cmake . -DRUN_IN_PLACE=TRUE
+    make -j$(nproc)
+`
+
+4) Run:
+`./bin/minetest`
 
 Windows:
 1) Download & Install the following: